Possible payment problem when buying tickets in our online webshop

Unfortunately we are experiencing technical difficulties in the Payment section of our webshop:  users of  Internet Explorer- and  Safari browsers sometimes encounter difficulties when chosing a preffered paying method.

If you encounter a payment error please try the following: 
-use a different browser. Chrome en Firefox should be working fine.
-try again a few moments later. The problem seems to raise its head not continously but only every now and then.

We are doing our best to solve the problem, however we expect it to be solved only after this weekend.
We apoligize for any inconvenience